Copolycarbonate, Copolycarbonate Composition, and Optical molded Article Obtained Therefrom

摘要

Provided is a copolycarbonate which can meet a wide range of molding conditions as a raw material and which results in providing good optical molded articles. It is a copolycarbonate comprising repetitive units represented by the following Formulas (I) and (II), wherein a content of the repetitive unit represented by Formula (II) described below is 1 to 30 mass %, and a viscosity number is 30 to 71. In the formulas, R¹ and R² represent an alkyl group having 1 to 6 carbon atoms; X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, -S-, -SO-, -SO₂-, -O-, -CO- or the like; R³ and R⁴ represent an alkyl group having 1 to 3 carbon atoms; Y represents a linear or branched alkylene group having 2 to 15 carbon atoms; a to d each are an integer of 0 to 4; and n is an integer of 2 to 450.